Distance+through+the+centre
131Naval tactics in the Age of Sail — A 17th century Spanish galleon Naval tactics in the Age of Sail were used from the early 17th century onward when sailing ships replaced oared galleys. These were used until the 1860s when steam powered ironclad warships rendered sailing line of… …
132Orbit of the Moon — Not to be confused with Lunar orbit in the sense of a selenocentric orbit, that is, an orbit around the Moon The Moon completes its orbit around the Earth in approximately 27.3 days (a sidereal month). The Earth and Moon orbit about their… …
